JP2002207625A - Data recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To validate a data signal which has been recorded even if a driving power source is turned off during the recording. SOLUTION: When a shutter button 50 is pressed, file name and size information '0' is written to a directory of a recording medium 33 and when a movie file is completely recorded, the size information of a directory entry is rewritten while FAT information showing the ring state of the movie file is written to a FAT area of the recording medium 44. A nonvolatile memory M is stored with the file name of the latest movie file and when the power switch is turned on, a CPU 46 detects the size information of the latest movie file from the directory entries according to the file name. When the detected size information shows '0', FAT information is generated according to a marker allocated to the latest movie file.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording apparatus, and more particularly to, for example, a digital camera. When a data signal recording instruction is given, predetermined information is recorded in a first area of a recording medium. Recording a data signal to which a marker is assigned in a predetermined manner in a second area of the recording medium, and after recording the data signal, writing recording position information of the data signal in a third area of the recording medium and rewriting the predetermined information; The present invention relates to a data recording device.

[0002]

2. Description of the Related Art As a method of recording a data signal on a recording medium, an FAT (File Alloc) of MS-DOS format is used.
ation Table) method is well known. In the FAT method, the data signal to be recorded is handled in cluster units. Therefore, even when the free area is discretely distributed by the repetition of recording and erasing, as long as the total of the free area exceeds the size of the data signal, the data signal is not changed. Can record without problems.

[0003]

However, in the FAT method, since the directory entry and the FAT information (link information) are updated after the recording of the data signal is completed, the power is shut off during the recording of the data signal. Then, the recorded data signal becomes invalid. That is, not only cannot the recorded data signal be reproduced, but also the recorded data signal is overwritten by the next recording process.

[0004] Therefore, a main object of the present invention is to provide a data recording apparatus which can validate a recorded data signal even when the power is turned off during recording.

[0005]

According to the present invention, when a data signal recording instruction is given, predetermined information indicating a predetermined value is written in a first area of a recording medium, and a plurality of markers are allocated in a predetermined manner. A data recording apparatus for recording a data signal in a second area of a recording medium, and after recording the data signal, writing recording position information of the data signal in a third area of the recording medium and updating a value indicated by predetermined information, Predetermined information detecting means for detecting predetermined information from the first area when the driving power is turned on, and when the predetermined information detected by the predetermined information detecting means indicates a predetermined value, a plurality of markers corresponding to the predetermined information are detected from the second area. Marker detecting means for detecting, creating means for creating recording position information based on the detection result of the marker detecting means, and recording position information created by the creating means in a third area Write to update the value indicated by the predetermined information detected by the writing and the predetermined information detection means /
A data recording device comprising updating means.

[0006]

When an instruction to record a data signal is given, predetermined information indicating a predetermined value is written to a first area of a recording medium, and a data signal to which a plurality of markers are assigned in a predetermined manner is written to a second area of the recording medium. Be recorded. When the recording of the data signal is completed, the recording position information of the data signal becomes the third position of the recording medium.
While being written to the area, the value indicated by the predetermined information is updated. Here, the predetermined information written in the first area is:
It is detected by the predetermined information detecting means when the driving power is turned on. When the detected predetermined information indicates a predetermined value, a plurality of markers corresponding to the predetermined information are detected from the second area by the marker detection means. The creating means creates the recording position information based on the detection result by the marker detecting means, and the writing / updating means writes the created recording position information in the third area, and writes the predetermined recording position information detected by the predetermined information detecting means. Update the value indicated by the information.

When a plurality of free partial areas are discretely formed in the second area, the data signal is recorded in the plurality of free partial areas, and the recording position information indicates a link state of the partial area where the data signal is recorded. .

Preferably, prior to the marker detection by the marker detecting means, a link is formed between the first partial area where the data signal is recorded and the second partial area where a signal other than the data signal is recorded. Then, after the marker detection is completed, the link of the first partial area is validated based on the detection result.

When the predetermined information is the size information of the data signal, the predetermined value indicates zero, and the marker detecting means detects the marker when the size information indicates zero.

When an identifier for specifying a data signal is generated by the generating means when a recording instruction is given, the generated identifier is allocated to predetermined information by the allocating means and is held by the holding means so as not to evaporate. Is done. The predetermined information detecting means detects the latest predetermined information based on the identifier held by the holding means and the identifier assigned to the predetermined information.

When a data signal is fetched by the fetching means, a first process for writing the fetched data signal to the buffer memory and a second process for recording the data signal stored in the buffer memory in a second area of the recording medium are as follows. , Are executed in parallel by the processing means.

When taking in commercial power by a plug,
The taken commercial power is converted into drive power by the conversion means.

[0013]

According to the present invention, when predetermined information has a predetermined value, recording position information is created based on a plurality of markers corresponding to the predetermined information, so that the drive power supply is turned off during recording. In this case, the recorded data signal can be validated.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0015]

Referring to FIG. 1, a digital camera 10 of this embodiment includes an image sensor 12. A color filter (not shown) is mounted on a front surface of the image sensor 12, and a light image of a subject is passed through the image sensor 1 via the color filter.
2 is irradiated.

When the power switch 54 is turned on, the switch SW1 is turned on by the system controller 48. The power supply circuit 56 converts AC power (commercial power) supplied via the power plug 58 into DC power (drive power), and supplies the converted DC power to the entire system.

The CPU 46 started by the DC power supply
First, the file name stored in the nonvolatile memory M is read, and the same file name as the read file name is searched from the directory entry of the recording medium 44. The recording medium 44 is formatted according to MS-DOS, and has a FAT area 44a, a root directory area 44b, and a data area 44c formed on the recording surface as shown in FIG. The file name is searched from the root directory area 44b. If the same file name is found, size information assigned to the found file name is detected, and the value indicated by the detected file information is determined. When the file information indicates a value other than “0”, the photographing process is started, and when the file information indicates “0”,
The recovery process starts.

That is, according to MS-DOS, when a file is created, the file name and size information indicating size 0 are written to the directory entry, and when the writing of data to the created file is completed, Is detected, and the size information of the directory entry is updated by the detected total size. Therefore, if the same file name as the file name stored in the non-volatile memory M exists in the directory entry, but the size information assigned to this file name indicates “0”, the file is inappropriate. Seems to be in condition.

In this embodiment, a normal photographing process is performed unless such an inappropriate file exists. However, if an inappropriate file exists, a recovery process is performed to return the inappropriate file to an appropriate state. . Note that the file name stored in the non-volatile memory M is the file name of the file (latest file) created by the previous shooting processing. When the size information detected from the directory entry indicates "0", a message "Restore file? YES NO" is displayed on the monitor 30, and the recovery is performed when YES is selected here. Move on to processing.

First, the photographing process will be described. In the photographing process, the operator can select a desired photographing mode from a plurality of photographing modes by operating the menu key 52.
Any of the resolution and frame rate of the captured image and the audio system, bit rate, and sampling rate of the captured audio differ in each shooting mode. When a desired photographing mode is selected, a corresponding information signal is provided from the system controller 48 to the CPU 46. CPU
46 is shooting mode information (resolution, frame rate, sound system, bit rate,
(Sampling rate) is stored in the nonvolatile memory M together with the file name of the movie file to be created.

The CPU 46 also instructs the timing generator (TG) 14 to perform photographing at the resolution and frame rate indicated by the photographing mode information. The TG 14 generates a timing signal according to a desired photographing mode (resolution, frame rate) based on a vertical synchronization signal and a horizontal synchronization signal output from a signal generator (SG) 16, and drives the image sensor 12 by a raster scan method. . A camera signal (charge) having a desired resolution is output at a desired frame rate from the image sensor 12,
The output camera signal passes through the CDS / AGC circuit 18 and the A / D converter 20 and is input to the signal processing circuit 22 as digital camera data.

The signal processing circuit 22 performs YUV conversion on the input camera data to generate YUV data, and transmits the generated YUV data to the SDR through the memory control circuit 24.
Stored in AM26. On the other hand, the video encoder 28
YUV from SDRAM 26 through memory control circuit 24
The data is read, and the read YUV data is encoded into a composite image signal. The encoded composite image signal is provided to a monitor 30, which
Monitor 3 is a real-time moving image (through image) of the subject
Displayed as 0.

The CPU 46 is equipped with a real-time OS, and the process of creating a movie file on the recording medium 44 and writing data to the created movie file are performed by BG (Back Ground) processing in parallel with the shooting process. At this time, an instruction list 46 as shown in FIG. 4 is used so that the processing can be smoothly performed between the photographing processing and the BG processing.
a is created.

When the operator presses the shutter button 50, the corresponding state signal is transmitted to the system controller 48.
From the CPU 46, “BG processing start”,
Commands and parameters corresponding to “file creation”, “table creation”, and “file open” are set in the instruction list 46a. First, the BG process is started by "Start BG process", and the file name of the movie file and the size information indicating "0" are written in the root directory area 44b shown in FIG. 5 by "Create file". In "table creation", a free space table 46b as shown in FIG. 6 is created. According to FIG. 6, the start address and the free size of each free area formed in the data area 44c are set in descending order of the size. In “file open”, a handle number for specifying a movie file to which data is to be written is created.

When the preparation for data writing is completed in this way, the CPU 46 performs a thumbnail image capturing process and a header information creating process in the next one frame period in order to create a movie file header. First,
It instructs the signal processing circuit 22 to perform the thinning process, and instructs the JPEG codec 32 to perform the compression process. Signal processing circuit 22
Performs a thinning process in addition to the above-described YUV conversion, and writes the thumbnail YUV data generated by this to the SDRAM 26 through the memory control circuit 24. JP
The EG codec 32 converts the thumbnail YUV data to SD
The data is read from the RAM 26 and subjected to JPEG compression, and the generated JPEG raw data (thumbnail) is written to the SDRAM 26 through the memory control circuit 24.

The CPU 46 also creates a JPEG header (thumbnail) by itself and sends the created JPEG header (thumbnail) through the memory control circuit 24 to the SDRAM 26.
Write to. Further, the CPU 46 itself creates header information including the above-described shooting mode information, and writes the created header information to the SDRAM 26. With this, JPEG
Raw data (thumbnail), JPEG header (thumbnail) and header information are stored in SDRAM as shown in FIG.
26.

In the instruction list 46a, "write file" is set in order to write JPEG raw data (thumbnail), JPEG header (thumbnail) and header information to the recording medium 44. The “file writing” is executed by the BG process, so that the movie file header shown in FIG. 7 is created in the data area 44c shown in FIG. The JPEG header (thumbnail) and JP
JP data shown in FIG.
EG data (thumbnail) is formed.

When the creation of the movie file header is completed, the CPU 46 performs an image capturing process and a voice capturing process each time a vertical synchronization signal is generated. In the image capturing process, the JPEG header created by itself is written into the SDRAM 26 through the memory control circuit 24, and a compression instruction is given to the JPEG codec 32. JP
When a compression instruction is given, the EG codec 32 reads the YUV data of the current frame from the SDRAM 26 through the memory control circuit 24, and performs a compression process on the read YUV data. When the JPEG raw data is generated by the compression processing, the JPEG raw data is written to the SDRAM 26 through the memory control circuit 24.

In the audio capturing process, the signal processing circuit 38
Is given a processing instruction. When a processing command is given, the signal processing circuit 38 transmits the audio data equivalent to one frame stored in the SRAM 38a through the memory control circuit 38a.
Write to DRAM 26. As a result of performing such image capturing processing and audio capturing processing for each frame period, the JPEG header, JPEG raw data, and audio data of each frame are stored in the SDRAM 2 as shown in FIG.
6 is mapped.

In FIG. 2, the JPEG header and the JPEG raw data are assigned serial numbers for each frame, while the audio data are assigned serial numbers for every three frames. Also, the JPEG header and J
One frame of JPEG data is formed by the PEG raw data, and a marker SOI (Start Of I) is provided at the beginning and end of the JPEG data of each frame as shown in FIG.
mage) and EOI (End Of Image).

The CPU 46 sets "write file" in the instruction list 46a every three frame periods in order to write audio data equivalent to three frames and JPEG data of three frames to the recording medium 44. By executing this “file writing” by the BG process,
An audio chunk consisting of audio data equivalent to 3 frames and 3
An image chunk consisting of JPEG data of a frame
The data is recorded in the data area 44c of the recording medium 44. As shown in FIG. 7, the audio chunk and the image chunk are mapped alternately on the movie file.

The CPU 46 creates index information of JPEG data and audio data every time three frame periods elapse. The index information of the JPEG data includes the data size of each frame and the distance from the beginning of the movie file when written to the recording medium 44. The index information of the audio data includes the data size equivalent to three frames and the recording medium 44. And the distance from the beginning of the movie file when it was written to the file. Such index information is first stored in the SDRAM as shown in FIG.
26. According to FIG. 3, the position information and the size information of the audio data corresponding to three frames and the position information and the size information of the JPEG data of three frames correspond to the SD data.
The data is alternately mapped in the RAM 26.

When the shutter button 50 is pressed again, C
The PU 46 stops the image capture and the voice capture, and sets “file write” in the instruction list 46a for writing the index information shown in FIG.
By executing this “file writing” by the BG process, an index chunk shown in FIG. 7 is formed at the end of the movie file. When the creation of the index chunk is completed, the CPU 46 calculates the total size value of the movie file created this time, and sets "write file" in the instruction list 46a to write the calculated total size value in the movie file header. By executing this file writing by the BG process, the total size value is added to the header information of the movie file header, thereby completing the creation of the movie file satisfying the QuickTime standard.

Subsequently, the CPU 46 sets "file close" and "BG processing end" in the instruction list 46a. When the “file close” is performed by the BG process, the size information written in the root directory area 44b and the FAT information written in the FAT area 44a are updated. Specifically, the file name of the movie file created this time is detected from the directory entry, and the size information assigned to the detected file name is updated from “0” to the total size value. Also, the FAT information is updated so that a link is formed in the write area (cluster) of the movie file created this time. The BG processing is terminated by “BG processing end”.

While the movie file is being created,
If the drive power is suddenly shut off due to the power plug 58 being disconnected from the outlet or the like, the creation of the movie file ends without updating the size information and the FAT information. The latest movie file remains in the recording medium 44 in an unfinished state as shown in FIG. In such a case, the size information assigned to the same file name as the file name stored in the nonvolatile memory M indicates “0” on the directory entry, and the recovery processing is performed at the next power-on. In the recovery processing, no instruction is set in the instruction list 46a, and no BG processing is performed.

At the time of the recovery process, the CPU 46 first reads out the shooting mode information and the file name from the nonvolatile memory M, and creates the free space table 46b shown in FIG. 6 by referring to the FAT information. Also in the restoration processing, the start address and the free size of each free area are listed in order from the free area with the largest size. No link is formed for the unfinished movie file, and the unfinished movie file is actually written in the free space listed in the free space table 46b. Therefore, C
The PU 46 updates the FAT information so that a link is formed in each free area set in the free area table 46a. As a result, a link is formed in each cluster in which the incomplete movie file is written in order from the file head. However, at this point, a link is also formed for data (unsuitable data) unrelated to the unfinished movie file.

Subsequently, the CPU 46 opens the unfinished movie file (creates a handle number), and reads out the header part data of the unfinished movie file to the SDRAM 26. Since the read header partial data includes the movie file header, the CPU 46 specifies the start address of the first audio chunk from this data, and points the file pointer F to the corresponding address on the movie file.
Set P. The file pointer FP is set on the movie file in the manner shown in FIG.

The CPU 46 calculates the size of one audio chunk based on the audio system, bit rate, and sampling rate of the audio data included in the shooting mode information, advances the file pointer FP by the calculated size, and The data for four frames is read from the current address of the FP onward. The size of one frame is calculated based on the resolution of the image data included in the shooting mode information.
Is stored in As a result, the JPEG data for three frames forming the first image chunk, the audio data corresponding to three frames forming the second audio chunk, and a part of the JPEG data forming the second image chunk are obtained as shown in FIG. Are mapped to the SDRAM 26 as shown in FIG.

At the beginning and end of the JPEG data of each frame, markers SOI and EOI are written. Here, the marker SOI is “ffd8” with 16 bits.
And the marker EOI is represented by “ffd9” with 16 bits, but since each address of the SDRAM 26 is 8 bits, “ffd8” and “ffd9” are represented using two addresses. That is, JPEG of each frame
“Ff” and “d8” are written in the first two addresses of the data, and “ff” and “d” are written in the last two addresses.
9 "is written. The CPU 46
The data value is read out one address at a time for the data of four frames stored in No. 6 and “d8” after “ff”.
Exists, it is considered that the marker SOI has been written, and if “d9” follows “ff”, the marker EO
It is assumed that I has been written.

By the above-described determination processing, the marker SO
If I and EOI are alternately detected three by three, SDR
It is determined that the AM 26 has JPEG data for three frames forming the movie file. At this time, index information is created for the three frames of JPEG data and the preceding three frames of audio data, and the created index information is written to the index information table 46c shown in FIG. Thereafter, the file pointer FP is moved to the start address of the next image chunk, data of four frames is read from the start address of the next image chunk and thereafter, and the same marker detection as described above is performed on the read data.

When the marker SOI is not detected from the beginning of the data for four frames written in the SDRAM 26, when the marker SOI or EOI is detected twice consecutively, or when the marker SOI is detected from the beginning of the data for four frames. Although detected, the marker EO will be
If no I is detected, it is determined that the data for the four frames includes inappropriate data that does not form a movie file. At this time, the index information is read from the index information table 46c, and an index chunk composed of the read index information is created after the address to which the file pointer FP currently points. As a result, all data for four frames written to the SDRAM 26 are invalidated.

When the creation of the index chunk is completed, the CPU 46 calculates the total size value of the activated incomplete movie file, and adds the calculated total size value to the header information of the movie file header.
The CPU 46 also updates the size information assigned to the file name of the unfinished movie file in the directory entry from “0” to this total size value.
Further, the CPU 46 updates the FAT information so as to invalidate the link of the area (cluster) in which the inappropriate data after the index chunk has been written. When the updating of the FAT information is completed, the recovery processing ends.

The CPU 46 is, specifically, shown in FIGS.
Process the flowchart shown in FIG. First, in step S1 of FIG. 11, the file name is read from the nonvolatile memory M, and in step S3, the root directory area 44a shown in FIG.
Search for the same file name from. If the same file name is not found, NO is determined in the step S5, and the process directly proceeds to the photographing process shown in FIG. On the other hand, if the same file name is found, the process proceeds from step S5 to step S7 to detect size information assigned to the found file name from the directory entry. In step S9, it is determined whether or not the detected size information indicates "0". If the size information is other than "0", the process directly proceeds to the photographing process in FIG. On the other hand, if the size information indicates "0", the process proceeds to step S11, and a message "Restore movie file? YES NO" is displayed on the monitor 30. Here, if “NO” is selected by a key operation, “NO” is determined in the step S13, and the process proceeds to the photographing process shown in FIG. 12. If “YES” is selected, “YES” is determined in the step S13, and FIG.
The processing shifts to the recovery processing shown in.

When the process shifts to the photographing process, first, in step S2
In step 1, a shooting mode selection process is performed. Specifically, a menu indicating a plurality of shooting modes is displayed on the monitor 30, and a desired shooting mode is determined in response to the operation of the menu key 52. When the shooting mode is determined, the process proceeds to step S23, and shooting mode information indicating the selected shooting mode is created. The setting information includes, for example, “resolution: QVGA”,
“Frame rate: 30 fps”, “sound system: stereo”, “bit rate: 8 bits”, and “sampling rate: 8 KHz”.

In step S25, the file name of the movie file created by the current photographing process is determined.
When NO is determined in step S5 or S13, the file name read from the non-volatile memory M is used as it is. When NO is determined in step S9, the file name found in the directory entry is used. The file name is determined by adding "1" to the file number. For example, if the found file name is "VC
LIP0002. MOV "," VCLIP00
03. MOV "is the current file name. When the shooting mode information and the file name are created / determined,
In step S27, the photographing mode information and the file name are stored in the nonvolatile memory M.

In step S29, a processing command is given to each of the TG 14, the signal processing circuit 22, and the video encoder 28 in order to display a through image. On the monitor 30, a through image of the subject is displayed. When the shutter button 50 is pressed by the operator in a state where the through image is displayed, “BG processing start”, “file creation”, “table creation”, and “file open” are shown in FIG. 4 in each of steps S33 to S39. Are set to list numbers "0" to "3" of the indicated instruction list 46a.

[0047]

[Table 1]

Referring to Table 1, in "start BG processing", FILE_STRT is set as a command, and "file creation"
Now, FILE_CREA as command, parameter 1 and 2
A TE, a drive number (a drive number for driving the recording medium 44) and a file path are set. In “Create table”, FILE is used as command and parameter 1
_SET_ALLOC and a drive number are set. In “file open”, FILE_OPEN, a drive number and a file path are set as a command, parameters 1 and 2. The file path set in “file creation” includes the file name and size information determined in step S25, and the file name and size information are written in the directory entry. However, since the movie file is incomplete, the size information indicates “0”.

After the process of step S39 is completed, SG
When the vertical synchronizing signal is output from the S16, step S41
Is determined as YES, and a thumbnail image capturing process is performed in step S43. Specifically, the JP that I created
The EG header (thumbnail) is written in the SDRAM 26, and the signal processing circuit 22 and the JPEG codec 32 are instructed to perform the thinning process and the compression process. The signal processing circuit 22 performs the thinning process of the YUV data over one frame period, and writes the thumbnail YUV data generated thereby to the SDRAM 26. J
The PEG codec 32 reads out the thumbnail YUV data from the SDRAM 26, performs a compression process,
The EG raw data (thumbnail) is written to the SDRAM 26. As shown in FIG. 2, the JPEG header (thumbnail) and the JPEG raw data (thumbnail)
6 is mapped. In a succeeding step S45, header information including the above-mentioned shooting mode information (resolution, frame rate, sound system, bit rate, sampling rate) is created, and the header information is written in the SDRAM 26. The header information is mapped on a JPEG header (thumbnail) as shown in FIG.

The header information, the JPEG header (thumbnail) and the JP
When the EG raw data (thumbnail) is stored in the SDRAM 26, “write file” is executed in step S47 in FIG.
Are set in the columns of the list numbers "4" and "5" of the instruction list 46a shown in FIG. As can be seen from Table 1, in "file write", FILE_WRITE, handle number (obtained by file open processing), SDRAM address and data size are set as commands, parameters 1, 2 and 3. The two "file writing" settings are made because the header information and the JPEG header (thumbnail) are continuous on the SDRAM 26, but the JPEG raw data (thumbnail) is stored at a remote location.

In the column of list number "4", the start address of the header information is set as the SDRAM address, and the total size of the header information and the JPEG header (thumbnail) is set as the data size. In the column of list number "5", the start address and size of JPEG raw data (thumbnail) are set as the SDRAM address and data size. As a result, on the movie file header shown in FIG. 7, the header information, the JPEG header (thumbnail) and the JPEG raw data (thumbnail) are consecutive in this order. As described above, JPEG data (thumbnail) is formed by the JPEG header (thumbnail) and JPEG raw data (thumbnail).

In a step S49, the frame number i is set to "0", and in a step S51, it is determined whether or not a vertical synchronizing signal is generated. When a vertical synchronizing signal is generated, a process of capturing one frame image is performed in step S53.
Specifically, the JPEG header created by the
26, and instructs the JPEG codec 32 to perform a compression process. JPEG codec 32 uses SDR
Read one frame of YUV data from AM26,
The read YUV data is subjected to compression processing, and the compressed JPEG raw data is subjected to SDRA as shown in FIG.
Write to M26. As described above, the JPEG data of the frame is formed by the JPEG header and the JPEG raw data obtained in the same frame.
Markers SOI and EOI at the beginning and end of data
Is written.

In step S55, a processing command is given to the signal processing circuit 38 in order to perform a process of capturing audio data corresponding to one frame. The signal processing circuit 38 has an A /
As shown in FIG. 2, the audio data corresponding to one frame provided from the D converter 36 and held in the SRAM 38a
Write to DRAM 26.

When the processing in step S55 is completed, the value of "i% 3" is determined in step S57. “I% 3” indicates the remainder when the frame number i is divided by “3”, and in step S55, the value indicated by this remainder is determined. If the remainder is not "2", the process directly proceeds to step S63, but if the remainder is "2", the index information is written in the SDRAM 26 in step S59, and "file write" is written in the instruction list 46a shown in FIG. After setting, the process proceeds to step S63.

As described above, on the movie file shown in FIG. 7, one audio chunk is formed by audio data for a time corresponding to three frames, and JP data for three frames is formed.
One image chunk is formed by the EG data.
In the index chunk, the position and size of audio data on a file are managed for each time corresponding to three frames, and the position and size of JPEG data on a file are managed for each frame.

Therefore, in step S59, the latest 3
For the frames, the position information and size information of the audio data corresponding to the three frames, and the JPE of each frame
The position information and size information of the G data are created, and the created index information is stored in the SD as shown in FIG.
Write to RAM 26.

As shown in FIG. 2, three frames of audio data are continuous on the SDRAM 26, but three frames of JPEG data (JPEG header and JPEG raw data) are discretely distributed on the SDRAM 26. For this reason, in step S61, a total of seven "file writing" are set in the instruction list 46a. In the “file write” set first among the seven “file write”, the SDRAM address is 3
The start address of the audio data for the frame is indicated, and the data size indicates the size of the audio data for the three frames of interest.

In the second, fourth, and sixth "file write" settings, the SDRAM address indicates the start address of the JPEG header of the target three frames, and the data size indicates the size of the JPEG header of the target three frames. Show. In the third, fifth and seventh “file write” settings, the SDRAM address indicates the start address of the JPEG raw data of the three frames of interest, and the data size is the JPE of the three frames of interest.
Shows the size of G raw data. Such an instruction list 46
As a result of the BG processing for the setting of “a”, audio chunks and image chunks are alternately distributed on the movie file as shown in FIG.

In a step S63, the frame number i is incremented. In a succeeding step S65, it is determined whether or not the shutter button 50 is operated. Unless the shutter button 50 is pressed, the processing of steps S51 to S63 is repeated, and the JPEG header, JPEG
The raw data and the audio data are mapped to the SDRAM 26 in the manner shown in FIG.

When the shutter button 50 is pressed, the flow advances to step S67 to determine the value of "i% 3". Where "i
If "% 3" is "2", the process directly proceeds to step S71, but if "i% 3" is "0" or "1", "file write" is set in the instruction list 46a in step S69, and then step S71 is performed. Proceed to S71.

When “i% 3” is “0”, the last audio chunk and image chunk are formed by one frame of audio data and JPEG data.
6a is set with a total of three “file write”. When “i% 3” is “1”, the last audio chunk and image chunk are two frames of audio data and J
It is formed by PEG data, and a total of five “file write” are set in the instruction list 46a. The SDRAM address and data size set for each "file write" are the same as those described above for audio data, JP
The start address and size of the EG header and JPEG raw data are shown. Thus, one frame or two
An audio chunk composed of audio data for one frame and an image chunk composed of one or two frames of JPEG data are formed in a movie file.

In step S71, "write file" is set in the instruction list 46a to write the index information shown in FIG. 3 into the movie file. The SDRAM address and data size set here are shown in FIG.
Shows the start address and the total size of the index information shown in FIG. This “file write” by BG processing
Is executed, an index chunk including all index information shown in FIG. 3 is formed at the end of the movie file.

In step S 73, the total size of the movie file is calculated based on the size information included in the index information, and the calculated total size data is written to the SDRAM 26. Subsequent steps S75 to S7
9, "File write", "File close"
And "BG processing end" is set in the instruction list 46a. The SDRAM address and data size set in “file write” indicate the start address and data size of the total size data. Also, FILE_CLOSE is set as a command in “file close”, and FILE_END is set as a command in “BG processing end”. By executing “write file” by the BG process, the total size value is added to the size information of the movie file header. Also, by executing the “file close” by the BG process, the size information of the directory entry (the size information written based on the process of step S35) is updated from “0” to the total size value, and is created this time. FAT so that a link is formed in the writing area of the movie file
The FAT information in the area 44b is updated. BG processing is
The process ends with “BG process end”.

In order to write the total size value into the movie file header, it is necessary to update the write destination address. Actually, the "seek process" is instructed before the "file write" setting in step S75. List 46a is set.

The BG process follows the flowchart shown in FIG. First, in step S81, the read destination list number L is set to "0", and in the subsequent step S83, the list number L is set.
It is determined whether or not the command read from is FILE_STRT. If YES here, the list number L is incremented in step S85, and the contents of the command read from the incremented list number L are stored in steps S87, S91, S95, S99, S103, and S1.
07 is determined.

If the read command is FILE_CREATE, YES is determined in the step S87, and a step S89 is performed.
Performs file creation processing. Specifically, the recording medium 44 is specified by the drive number set in the parameter 1 and the file name and the size information indicating the size 0 are stored in the directory entry of the recording medium 44 based on the file path set in the parameter 2. Write. Upon completion of the process, the process returns to the step S85.

The read command is FILE_SET_ALLOC
If it is, YES is determined in the step S91, and the step S91 is performed.
At 93, a table creation process is performed. That is, the recording medium 44 is specified by the drive number set in the parameter 1, and the free area table 46b shown in FIG. 6 is created with reference to the FAT information. Upon completion of the processing, step S85 is performed.
Return to

If the read command is FILE_OPEN, the flow advances from step S95 to step S97 to perform file open processing. That is, the recording medium 44 is specified by the drive number set in the parameter 1, the file is specified based on the file path set in the parameter 2, and a handle number assigned to this file is created. The created handle number is used for the photographing process. Upon completion of the process, the process returns to the step S85.

If the read command is FILE_WRITE, the flow advances from step S99 to step S101 to perform a file writing process. Specifically, parameter 1
, The write destination movie file is specified by the handle number set in, the read start address and read size are specified according to the SDRAM address and data size set in parameters 2 and 3, and the read start address and read size are specified based on the read start address and read size. The data read from the SDRAM 26 is written to the movie file specified by the handle number. Further, the data size read from the instruction list 46a is integrated, and FAT information indicating the link state of the written cluster is created each time writing of one cluster is completed.
The integrated value of data size and FAT information are in SDRAM
26. Upon completion of the process, the process returns to the step S85.

If the read command is FILE_CLOSE, the flow advances from step S103 to step S105 to perform a file closing process. Specifically, the size information assigned to the file name of the open movie file is updated with the total size value held in the SDRAM 26, and the FAT information in the FAT area 44b is updated with the FAT information held in the SDRAM 26. . Upon completion of the process, the process returns to the step S85.

If the read command is FILE_END, “NO” is determined in the step S103, and a step S81 is performed.
Return to The BG process shifts to a standby state.

When the process shifts to the recovery process because an unfinished movie file exists in the recording medium 44, the CPU 46 processes the flowcharts shown in FIGS. First, in step S111, the shooting mode information and the file name of the unfinished movie file are read from the non-volatile memory M, the free area table 46a shown in FIG. 6 is created in step S113, and each of the data formed in the data area 44c in step S115. FAT information is updated so that a link is formed in a free area (vacant cluster). An incomplete movie file as shown in FIG. 8 is recorded in the free area where the link is formed. In step S117, the incomplete movie file is opened based on the file name detected from the nonvolatile memory M. .

At step S119, the header part data of the opened uncompleted movie file (data including the movie file header and a part of the first audio chunk) is read from the data area 44c, and the read header part data is stored in the SDRAM 26. Write. Since the data size of the movie file header is predetermined,
In step S121, the head address of the first audio chunk is detected from the header partial data stored in the SDRAM 26. In step S123, the file pointer FP is set to the address on the movie file corresponding to the detected head address. The file pointer FP is shown in FIG.
Is set at the head address of the audio data 0 in the manner shown in FIG.

When the processing of step S123 is completed, the frame number i is set to "0" in step S125, and the file pointer FP is advanced by one voice chunk in step S127. The size of the audio chunk is calculated based on the shooting mode information detected from the nonvolatile memory M, and the updated file pointer FP points to the head address of the image chunk. In step S129, a predetermined amount of data existing after the updated file pointer FP is read from the data area 44c, and the read data is written to the SDRAM 26. This predetermined amount is an amount corresponding to JPEG data for four frames, and is also calculated based on the shooting mode information read from the nonvolatile memory M. The read data includes one image chunk, one audio chunk, and some JPEG data in this order, and these data are mapped to the SDRAM 26 as shown in FIG.

In step S131, the pointer ptr is set to the address MOV shown in FIG. Address MOV
Is the start address of a predetermined amount of data stored in the SDRAM 26. When the pointer ptr is set, the flag SOI_flg is reset in step S133, and “* ptr” is compared with “ff” in step S135.
In step S137, the setting destination of the pointer ptr is advanced by one address, and in step S139, “* ptr” is changed to “d”.
8 ".

"* Ptr" means an address value of a setting destination of the pointer ptr, and "0x" means hexadecimal display. As described above, the value of the marker SOI is 16 bits “ffd8”, and each address of the SDRAM 26 is 8 bits.
Since it is a bit, “ffd8” is represented using two addresses. Steps S135 to S139 are processing for determining whether or not the marker SOI has been written at the two addresses of interest.

If the marker SOI is not detected, NO is determined in one of steps S135 and S139. In this case, the process proceeds to step S171, assuming that the predetermined amount of data stored in the SDRAM 26 is inappropriate data that does not constitute an incomplete movie file.
On the other hand, when the marker SOI is detected,
9 to step S141, and the flag SOI_flg
Is set to “1”, and the pointer cptr is set to “ptr−1”. The pointer cptr points to the start address of the image chunk.

In step S143, the pointer ptr is set to 1
The address is updated, and in the subsequent step S145, the pointer p
The setting destination address of tr is determined. Here, if the set destination address does not exceed “MOV + predetermined amount”, the processing of steps S147 to S153 is performed. Step S147
In step S14, “* ptr” is compared with “ff”.
In step 9, the setting destination of the pointer ptr is updated by one address. In step S151, "* ptr" is compared with "d8".
In step S153, “* ptr” is compared with “d9”. “Ffd8” indicates a 16-bit value of the marker SOI, and “ffd9” indicates a 16-bit value of the marker EOI. Therefore, steps S147 to S153 are processes for determining whether or not the marker SOI or EOI is written at the two addresses of interest.

If the first address value of the two addresses of interest is not "ff", the process returns to step S143 without determining the next address value. If the first address value is "ff", it is determined in step S151 whether or not the next address value is "d8", and it is determined in step S153 whether or not the next address value is "d9". If the address value indicates "d8", step S15
1 to step S171, and the address value is "d9"
Indicates from the step S153, the process proceeds to the step S155. If the address value is neither “d8” nor “d9”, the process returns to the step S143.

That is, when the marker SOI is detected again following the detection of the marker SOI in steps S135 to S139, the predetermined amount of data stored in the SDRAM 26 includes inappropriate data other than the unfinished movie file. And proceeds to step S171. Also, before the marker EOI is detected, the pointer ptr
When the set destination address exceeds "MOV + predetermined amount", it is considered that the predetermined amount of data includes inappropriate data other than the unfinished movie file, and the process proceeds to step S1.
Go to 71. On the other hand, when the marker EOI is detected,
Although it is unknown whether or not inappropriate data is stored in the SDRAM 26, it is considered that at least one frame of JPEG data constituting the incomplete movie file is stored in the SDRAM 26, and the process proceeds to step S155.

In step S155, the pointer ptr is set to 1
In step S157, the size of the JPEG data of one frame detected this time is calculated according to Equation 1.

[0082]

## EQU1 ## size [i% 3] = ptr-cptr When numbers "0" to "2" are assigned to three frames of JPEG data constituting one image chunk, "i% 3" in equation 1 is assigned to this assignment. Matches the number. Pointer p
tr points to the address next to the two addresses where the marker EOI is written, and the pointer cptr indicates the marker SOI
Points to the first address of the two addresses in which is written. Therefore, the pointer ptr is changed from the pointer ptr to the pointer cp.
By subtracting tr, the JPE detected this time
The size of the G data is calculated.

In step S159, the frame number i is incremented, and in step S161, the value of "i% 3" is determined. Here, if i% 3 で 0, SDRAM2
6 remaining in the image chunk stored in
The process returns to step S133 to detect the SOI marker and the EOI marker from the data.

On the other hand, if i% 3 = 0, the flow advances to step S163 to write the index information of the image chunk stored in the SDRAM 26 and the audio chunk preceding this image chunk in the index information table 46c shown in FIG. . That is, the start position information and the size information of the JPEG data of each frame included in the image chunk and the start position information and the size information of the audio chunk that is continuous before the image chunk are written in the index information table 46c. In step S165, the same image chunk as the image chunk stored in the SDRAM 26 is specified from the movie file, and the file pointer FP is set to the address next to the end address of the specified image chunk. Upon completion of the process in the step S165, the process returns to the step S127.

Since the index information is created only when it is determined that i% 3 = 0, the JPEG data for forming the unfinished movie file and the unfinished movie file are formed on a predetermined amount of data stored in the SDRAM 26. If unsuitable data is mixed, all such mixed data is invalidated.

When the process proceeds to step S171 shown in FIG. 19, first, in this step, the formula 2 is calculated, and J
The total number of frames of the PEG data is obtained. According to Equation 2,
The number of frames “i% 3” of the JPEG data to be invalidated is subtracted from the current frame number i. The calculated total number of frames is added to the header information of the movie file header.

[0087]

## EQU2 ## In the following step S173, an index chunk including the index information written in the index information table 46c shown in FIG. 10 is created after the file pointer FP. In step S175, the total size value of the incomplete movie file to be activated is calculated based on the size information written in the index information table 46c. In step S177, the calculated total size value is added to the header information of the movie file header, and in step S177, a file closing process is performed. In the file closing process, the size information indicating the calculated total size is written in the column of the unfinished movie file of the directory entry, and the link formed in the writing area of the activated unfinished movie file is validated. Some audio data and JPEG
The FAT information is updated so that the links formed in the data writing area and the subsequent inappropriate data writing area are invalidated. When the file closing process is completed, the restoration process ends.

As can be understood from the above description, when the shutter button 50 is operated, the file name and the size information indicating "0" are written in the directory entry of the recording medium 44, and the markers SOI and EOI are displayed at the beginning and end. Is recorded in the data area 44 b of the recording medium 44. When the recording of the movie file is completed, FAT information indicating the link state of the movie file is written to the FAT area 44a of the recording medium 44, and the size information is updated by the total size of the movie file.

Here, the latest size information written in the directory entry is detected by the CPU 46 when the drive power is turned on. When the detected size information indicates "0", it is considered that an incomplete movie file exists in the data area 44c, and the markers SOI and EOI are detected from the data area 44c. CPU 46
Is based on the detection results of the markers SOI and EOI.
The AT information is created, the created FAT information is written into the FAT area 44b, and the detected size information is updated with the total size of the unfinished movie file.

As described above, since the FAT information is created based on the markers SOI and EOI recorded in the data area 44c, the incomplete movie file is valid even when the power is suddenly shut off during the photographing. Can be

In this embodiment, the FAT system is adopted as a moving image signal recording system, but a UDF (Universal Disk Format) system may be adopted instead.

According to the JPEG standard, the above-mentioned SO
In addition to I and EOI, APP0 (Application Marker
Segment0), DQT (Define Quantization Tabl)
e), DHT (Define Haffman table), SOF (Start
Markers such as Of Frame) and SOS (Start Of Scan) are also assigned to the compressed image data of each frame. Therefore, the movie file may be restored using these markers.

Further, in this embodiment, the description is made using a digital camera. However, it goes without saying that the present invention can also be applied to a stationary hard disk recorder for recording TV programs, for example.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an illustrative view showing one example of a mapping state of an SDRAM;

FIG. 3 is an illustrative view showing another example of a mapping state of the SDRAM;

FIG. 4 is an illustrative view showing a structure of an instruction list;

FIG. 5 is an illustrative view showing one example of a configuration of a recording medium;

FIG. 6 is an illustrative view showing one example of a configuration of a free area table;

FIG. 7 is an illustrative view showing a structure of a movie file in a completed state;

FIG. 8 is an illustrative view showing a structure of a movie file in an unfinished state;

FIG. 9 is an illustrative view showing another example of a mapping state of the SDRAM;

FIG. 10 is an illustrative view showing a structure of an index information table;

FIG. 11 is a flowchart showing a part of the operation of the CPU when the camera is activated.

FIG. 12 is a flowchart showing a part of the operation of the CPU when performing a photographing process;

FIG. 13 is a flowchart showing another part of the operation of the CPU when performing the shooting processing.

FIG. 14 is a flowchart showing another portion of the operation of the CPU when performing the shooting processing.

FIG. 15 is a flowchart showing a part of the operation of the CPU when performing BG processing;

FIG. 16 is a flowchart showing a part of the operation of the CPU when performing the recovery processing;

FIG. 17 is a flowchart showing another portion of the behavior of the CPU when performing the recovery process;

FIG. 18 is a flowchart showing another portion of the behavior of the CPU when performing the restoration process.

FIG. 19 is a flowchart showing yet another portion of the behavior of the CPU when performing the recovery process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Digital camera 12 ... Image sensor 22, 38 ... Signal processing circuit 26 ... SDRAM 32 ... JPEG codec 34 ... Microphone 44 ... Recording medium 46 ... CPU 56 ... Power supply circuit 58 ... Power supply plug

Claims (7)

[Claims] When a recording instruction of a data signal is given,
Writing predetermined information indicating a predetermined value in a first area of a recording medium, recording the data signal to which a plurality of markers are allocated in a predetermined manner in a second area of the recording medium, and after the recording of the data signal is completed. In a data recording apparatus for writing recording position information of the data signal in a third area of the recording medium and updating a value indicated by the predetermined information, the predetermined information is detected from the first area when a driving power is turned on. Predetermined information detection means; marker detection means for detecting the plurality of markers corresponding to the predetermined information from the second area when the predetermined information detected by the predetermined information detection means indicates the predetermined value; Creating means for creating the recording position information based on the detection result of the above, and the recording area information created by the creating means is stored in the third area. Characterized in that it comprises a write / update means for updating the predetermined information indicates a value detected by the writing and the predetermined information detection means, the data recording device. 2. A plurality of free space areas are discretely formed in the second area, the data signal is recorded in the plurality of free space areas, and the recording position information is a part where the data signal is recorded. 2. The data recording device according to claim 1, wherein the data recording device indicates a link state of the area. 3. The creation means forms a link in a first partial area where the data signal is recorded and a second partial area where a signal other than the data signal is recorded prior to marker detection by the marker detection means. The first linking means based on the detection result of the marker detecting means.
3. The data recording apparatus according to claim 2, further comprising an activating means for activating a link of the partial area. 4. The method according to claim 1, wherein the predetermined information is size information of the data signal, the predetermined value indicates zero, and the marker detection means performs marker detection when the size information indicates the zero. The data recording device according to any one of the above. 5. Generating means for generating an identifier for specifying the data signal when the recording instruction is given, allocating means for allocating the identifier to the predetermined information,
And holding means for holding the identifier so as not to be volatilized, wherein the predetermined information detecting means is configured to update the predetermined information based on the identifier held by the holding means and the identifier assigned to the predetermined information. 5. The data recording device according to claim 1, wherein the data recording device detects information. 6. A capturing means for capturing the data signal.
And a first process of writing the data signal fetched by the fetch means into a buffer memory and a second process of recording the data signal stored in the buffer memory in the second area of the recording medium in parallel The data recording device according to claim 1, further comprising a processing unit that executes. 7. The data recording apparatus according to claim 1, further comprising a plug for taking in commercial power, and a conversion unit for converting said commercial power into said drive power.